US5074191A - Brake booster housing with a hub structure containing a valve mechanism arranged inside the housing - Google Patents

Brake booster housing with a hub structure containing a valve mechanism arranged inside the housing Download PDF

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Publication number
US5074191A
US5074191A US07/529,001 US52900190A US5074191A US 5074191 A US5074191 A US 5074191A US 52900190 A US52900190 A US 52900190A US 5074191 A US5074191 A US 5074191A
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US
United States
Prior art keywords
shutter
booster
housing
input member
shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/529,001
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English (en)
Inventor
Guy Meynier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix Europe Services Techniques SA
Original Assignee
Bendix Europe Services Techniques SA
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Filing date
Publication date
Application filed by Bendix Europe Services Techniques SA filed Critical Bendix Europe Services Techniques SA
Assigned to BENDIX EUROPE SERVICES TECHNIQUES, reassignment BENDIX EUROPE SERVICES TECHNIQUES, ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MEYNIER, GUY
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Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B60T13/567—Vacuum systems indirect, i.e. vacuum booster units characterised by constructional features of the casing or by its strengthening or mounting arrangements

Definitions

  • the present invention relates to pneumatic brake boosters of the type comprising a housing formed from two front and rear half-shells, a piston structure dividing the housing internally into two chambers and composed of an assembly consisting of a plate and of a diaphragm and possessing centrally a hub structure containing a distribution valve means actuable by an input member in order to generate a pressure difference selectively between the chambers, the valve means comprising a plunger mounted axially slideably in a central bore of the valve body and connected to the input member, the plunger defining a first shutter seat at one of its ends, a second shutter seat being formed in the valve body concentrically relative to the first shutter seat and a shutter means mounted in the valve body and stressed elastically towards the first and second shutter seats, at least one elastic means stressing the input member axially away from the shutter seats.
  • Boosters of this type are well known in the prior art.
  • the hub structure is composed of an integral solid piece which contains the distribution valve means and a tubular part of which extends rearwards on the outside of the housing, so as to receive an input rod intended to be connected to a brake pedal.
  • An object of the present invention is to provide a pneumatic booster of the type defined in general terms above, which is of lightweight design, robust, of low production cost and of reduced overall size and which allows automated assembly on a motor vehicle, without demanding a high accuracy of the assembly robot.
  • the hub structure and the valve hub are arranged inside the housing. This produces a booster no longer having a chimney on the rear part of the housing, thereby achieving a reduced weight and overall size.
  • the rear half-shell of the booster possesses an assembly part extending rearwards and intended for fastening the booster to the apron of a motor vehicle.
  • this assembly part interacts with slots or slideways formed on the apron of the vehicle.
  • the mounting of the booster if appropriate equipped with a master cylinder and with a brake-fluid reservoir, can be carried out laterally.
  • FIGURE is a view in longitudinal section of a pneumatic brake booster according to the invention.
  • the direction in which the movable elements move in order to occupy their rest position will be called the “rear” of the booster and the direction in which the movable elements are moved during their actuation will be called the "front”.
  • the rear of the booster is thus shown in the right-hand part of the FIGURE, the front being located on the left.
  • the single FIGURE shows, in section, a pneumatic brake booster of the vacuum type, comprising a housing formed from a rear half-shell 10 and from a front half-shell 12 divided internally into a front chamber, or vacuum chamber 14, and a rear chamber, or working chamber 16, by means of a movable piston structure composed of an assembly consisting of a plate 18 and of a flexible diaphragm 20, the periphery of which is retained between the two half-shells of the housing.
  • the plate 18 possesses a central part 22 which defines a hub structure 24 containing a distribution valve means designated as a whole by the reference 26.
  • the valve means comprises a valve plunger 28 coupled to a booster input member intended to be actuated by a brake pedal, as will be described later.
  • the valve plunger 28 is mounted slideably in a stepped bore 30 formed in the central part 22 of the plate 18.
  • the rear end of the valve plunger 28 forms a first shutter seat 32 concentric relative to a second shutter seat 32 formed by the central part 22, these two shutter seats being intended to interact with a shutter element 36 stressed elastically in the direction of the shutter seats.
  • the shutter element 36 comprises a peripheral part or mounting bead 38 fitted into and retained in a tubular extension 40 extending towards the rear of the central part 22.
  • the latter possesses, for example in the vicinity of its periphery, at least one axial passage 42 establishing communication between the vacuum chamber 14 and the shutter element 36 and a radial passage 44 establishing communication between the working chamber 16 and the shutter element 36.
  • a reaction disc 46 is interposed between the rear end of an output rod 48 of the booster (intended to be coupled to a piston of a master cylinder not shown), on the one hand, and the front face of the valve plunger 28 and a front annular surface 72 of the central part 22 of the plate 18, on the other hand.
  • the hub structure and the valve means are arranged inside the housing, more specifically inside the rearwardly extending tubular part 40 of the central part 22, this tubular part 40 itself being arranged completely within the booster housing, as can be seen in the FIGURE.
  • the shutter element 36 is extended, beyond the bead forming the mounting part 38, by a peripheral part 50, itself terminating in a part 52, for example in the form of a bead, engaging the rear half-shell sealingly.
  • the peripheral part 50 surrounds the tubular part 40 and can advantageously come to rest within a tubular part 54 fixed to the rear half-shell of the booster and extending forwards. Sealing can advantageously be ensured at the junction of the rear half-shell and the tubular part 54 by means of the part 52.
  • the rear working chamber 16 of the booster is delimited by the diaphragm 20 associated with the plate 18, by the rear half-shell 10 and by the peripheral part 50 of the shutter element 36.
  • the valve plunger 28 can be connected to an input member 56, the rear part of which extends radially outwards and, in the rest position, comes up against the rear half-shell, the rear part of the input member 56 being of a diameter larger than that of an orifice 58 made in the rear half-shell.
  • a return spring 60 of the input member 56 bears, on the one hand, on the sheet-metal mounting support of the shutter element 36 in the tubular element 40 and, on the other hand, on the front face of the rear part of the input member 56.
  • the booster is of compact form since it no longer has a rear chimney, this contributing to making it lighter and less bulky.
  • the booster can be fastened to the vehicle by any suitable means, but advantageously the rear half-shell is intended to be equipped with an assembly part 64.
  • This assembly part can take the form of tabs projecting rearwards or of an annular collar having a fastening part 66 on the outside of the rear half-shell and a frustoconical part 68.
  • the assembly part 64 is thus intended to interact with slideways or slots formed on the apron 70 of the vehicle, in such a way that the booster can be installed on this apron as a result of a translational movement perpendicular relative to its axis.
  • the end of the slots or slideways will therefore be shaped in a known way in order to lock the booster when it reaches the correct position and keep it in this position.
  • the booster can then be actuated by the rod 62, advantageously in the form of a pusher, supported in terms of axial translational movement by an element fixed to the apron 70, and itself actuated by a brake pedal.
  • the front end of the pusher and the rear end of the input member are substantially of spherical form and have convexities confronting one another, so as not to disturb the translational movement during assembly.
  • a booster of which the mounting on a vehicle can easily be automated, has thus been provided, the assembly robot needing to execute only the operations of grasping the booster and pushing it laterally into the slots or slideways provided on the apron of the vehicle, until it is as far as it will go.
  • the booster will then be locked in position, the input member 56 being located in front of the actuating rod 62.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Braking Systems And Boosters (AREA)
US07/529,001 1989-06-15 1990-05-24 Brake booster housing with a hub structure containing a valve mechanism arranged inside the housing Expired - Lifetime US5074191A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907982A FR2648415A1 (fr) 1989-06-15 1989-06-15 Servomoteur d'assistance au freinage
FR8907982 1989-06-15

Publications (1)

Publication Number Publication Date
US5074191A true US5074191A (en) 1991-12-24

Family

ID=9382780

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/529,001 Expired - Lifetime US5074191A (en) 1989-06-15 1990-05-24 Brake booster housing with a hub structure containing a valve mechanism arranged inside the housing

Country Status (8)

Country Link
US (1) US5074191A (de)
EP (1) EP0406033B1 (de)
JP (1) JP2794478B2 (de)
KR (1) KR970009359B1 (de)
BR (1) BR9002912A (de)
DE (1) DE69001329T2 (de)
ES (1) ES2040074T3 (de)
FR (1) FR2648415A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5335582A (en) * 1992-03-06 1994-08-09 Allied-Signal Inc. Vacuum brake booster
FR2848963A1 (fr) * 2002-12-20 2004-06-25 Bosch Gmbh Robert Servomoteur pneumatique d'assistance de freinage muni d'un dispositif de fixation dans un vehicule et procede de montage

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1765760A (en) * 1927-10-06 1930-06-24 Dorsey G Duty Servo-motor for brakes
US2985143A (en) * 1960-07-01 1961-05-23 Kelsey Hayes Co Fluid pressure motor mechanism
GB1100380A (en) * 1964-09-30 1968-01-24 Bendix Corp Fluid pressure servomotor
GB1161989A (en) * 1965-10-21 1969-08-20 Bendix Corp Improvements in Fluid Pressure Servomotors
GB2079390A (en) * 1980-07-04 1982-01-20 Teves Gmbh Alfred Brake booster
US4499812A (en) * 1982-10-29 1985-02-19 Societe Anonyme D.B.A. Servo-motor for power-assisted braking
US4718324A (en) * 1985-04-17 1988-01-12 Bendix France S.A. Servomotor for assisting with braking incorporating a switch for a stop signal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1765760A (en) * 1927-10-06 1930-06-24 Dorsey G Duty Servo-motor for brakes
US2985143A (en) * 1960-07-01 1961-05-23 Kelsey Hayes Co Fluid pressure motor mechanism
GB1100380A (en) * 1964-09-30 1968-01-24 Bendix Corp Fluid pressure servomotor
GB1161989A (en) * 1965-10-21 1969-08-20 Bendix Corp Improvements in Fluid Pressure Servomotors
GB2079390A (en) * 1980-07-04 1982-01-20 Teves Gmbh Alfred Brake booster
US4499812A (en) * 1982-10-29 1985-02-19 Societe Anonyme D.B.A. Servo-motor for power-assisted braking
US4718324A (en) * 1985-04-17 1988-01-12 Bendix France S.A. Servomotor for assisting with braking incorporating a switch for a stop signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5335582A (en) * 1992-03-06 1994-08-09 Allied-Signal Inc. Vacuum brake booster
FR2848963A1 (fr) * 2002-12-20 2004-06-25 Bosch Gmbh Robert Servomoteur pneumatique d'assistance de freinage muni d'un dispositif de fixation dans un vehicule et procede de montage

Also Published As

Publication number Publication date
KR970009359B1 (en) 1997-06-12
DE69001329T2 (de) 1993-07-22
EP0406033B1 (de) 1993-04-14
EP0406033A1 (de) 1991-01-02
FR2648415A1 (fr) 1990-12-21
JPH0390466A (ja) 1991-04-16
BR9002912A (pt) 1991-08-20
ES2040074T3 (es) 1993-10-01
DE69001329D1 (de) 1993-05-19
JP2794478B2 (ja) 1998-09-03
KR910000453A (ko) 1991-01-29

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